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In a large mixing bowl, mix together the cold mashed potatoes and the egg. Make sure the egg is evenly distributed through the potatoes.
Add the grated onion, flour, salt, and pepper and use a fork to gently mix in the ingredients.
Add enough oil to a large fry pan so that it is approximately 1/2" deep and place over medium heat. Allow the oil to come to temperature, about 350°F.
Scoop scant 1/2 cups of the potato mixture and gently drop them into the hot oil. Do not overcrowd the pan -- cook no more than 3-4 patties at a time. Gently, flatten each mound into a patty shape with a spatula.
Fry for about 2 1/2 to 3 minutes on the first side, until golden brown. Then, slide the spatula under the patty and turn it over. You'll find enlisting a second utensil makes the flip a bit easier! Then, cook for another 2 to 2 1/2 minutes.
Transfer the cooked patty to a cooling rack placed over paper towels. Allow to cool slightly, serve, and enjoy!